The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Design and Performance Analysis of a Decision-feedback Coherent Code Tracking Loop for WCDMA Systems

WCDMA 시스템을 위한 판정궤환 동기식 동기추적 회로의 설계 및 성능분석

  • 박형래 (한국항공대학교 대학원 정보통신공학과) ;
  • 양연실 (삼성전자 네트워크 사업) ;
  • 김영선 (한국항공대학교 대학원 정보통신공학) ;
  • 김창주 (한국전자통신연구소)
  • Published : 2004.04.01
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Abstract

In this paper, a decision-feedback coherent code tracking loop is designed for WCDMA systems and its performance is analyzed in terms of jitter variance considering the effect of phase and symbol estimation errors for both AWGN and fading environments. An analytical closed-form formula for jitter variance is Int derived for AWGN environments as a function of a pulse-shaping filter, timing offset, signal-to-interference ratio, and loop bandwidth while involving the phase estimation error and bit error rate, and the upper bound of jitter variance is derived for fading environments. Finally a second-order coherent code tracking loop is designed with the DPCH frame format #13 of the WCDHA forward link selected as a target system, and its performance is evaluated by the closed-form formula and compared with the simulation results for both AWGN and Rayleigh fading environments.

본 논문에서는 WCDMA 시스템을 위한 판정궤환 동기식 동기추적 회로 (decision-feedback coherent code tracking loop)를 설계하고 AWGN 환경과 페이딩 환경에서 위상 에러와 심볼 에러의 영향을 고려하여 지터 분산을 해석한다. 먼저, AWGN 환경에서의 지터 분산을 위상 에러와 비트 오율을 포함하여 펄스성형 필터(pulse-shaping filter), 타이밍 오프셋 (timing offset), 신호 대 잡음비 (signal-to-interferences ratio), 루우프 대역폭(loop-bandwidth)에 대한 일반식으로 유도하고 페이딩 환경에서 지터 분산의 상한치 (upper bonnd)를 유도한다. 끝으로, WCDMA 순방향 링크의 DPCH 프레임 포맷 #13을 목표 시스템(target system)으로 설정하여 2차 동기식 등기추적 회로를 설계하고 AWGN 환경과 Rayleigh 페이딩 환경에서 지터 분산의 이론치와 시뮬레이션 결과를 비교, 분석한다.

Keywords

References

  1. CDMA: Principles of spread spectrum communication A.J.Viterbi
  2. Proc. ACTS A comparative performance analysis of noncoherent delay-lock code tracking loops for DS-CDMA systems H.R.Park;K.J.Lee;H.Lee;C.Cho
  3. Proc. PIMRC Design and performance analysis of a noncoherent code tracking loop with variable loop bandwidth Y.S.Yang;S.H.Lee;S.S.Yoon;H.R.Park
  4. IEEE Trans. Commun v.25 no.3 Noncoherent pseudonoise code tracking performance of spread spectrum receivers M.K.Simon https://doi.org/10.1109/TCOM.1977.1093819
  5. IEEE Trans. Commun. v.45 no.5 Performance of digital code tracking loops for direct-sequence spread-spectrum signals in mobile radio channels S.L.Su;N.Y.Yen https://doi.org/10.1109/26.592560
  6. 한국통신학회논문지 3GPP 모뎀용 동기추적 회로의 설계 및 성능 분석 양연실;박형래
  7. IEICE Trans. on Commun. v.E81-B no.7 Coherent delay-locked code tracking loop using time-multiplexed pilot for DS-CDMA mobile radio M.Sawahashi;F.Adachi;H.Yamamoto
  8. IEEE Trans. Commun. v.39 no.5 Decision-directed coherent delay-lick tracking loop for DS-spread-spectrum signals R. De Gaudenzi;M.Luise https://doi.org/10.1109/26.87166
  9. IEEE Trans. Veh. Technol. v.48 no.5 Direct-sequence spread-spectrum chip tracking in the presence of unresolvable multipath components R. De Gaudenzi https://doi.org/10.1109/25.790533
  10. Proc. PIMRC Performance of coherent and noncoherent DLL in AWGN channel H.Boujemaa;M.Siala
  11. 3GPP TS 25.104 V5.3.0, BS Radio transmission and reception (FDD) (Release5)
  12. Digital communications and spread spectrum systems R.E.Ziemer;R.L.Peterson
  13. Detection of signals in noise Anthony D. Whalen
  14. Phase-locked loops A.Blanchard
  15. Phaselock techniques(2nd edition) F.M.Gardener